Steam-boiler furnace.



No. 672,78I; Patented Apr. 23, I90I1.

w. KENT.l STEAM BUILER FURNACE.

(Application led Oct. 17,' 1900.) (No Modli)4 ""ATnNT r FFICE@ l `WILLIAM KENT, OF PASSAIC, NEW JERSEY.`

STEAM-BOILER FURNACE.`

SPEGIFICATIQN forming part of Letters Patent N o. 672,781, dated April 23, 1901.

Application filed October 17, 1900. Serial No. 33,355. No model.)l

. To al?, whom it may concern; v 'Be it known that I, WILLIAM KENT, a citizen of. the United States, residing at Passaic, in the countyof Passaic and State of New Jersey, have inye-ntedycertain new and useful Improvementsin FurnacesforSteam-Boilers; @and I do hereby declare,thefollowingto be a t y i full,`clear, andexact description of the invention,-such asfwill enable others skilled in the v art to whichit appertains to makeand use the ".fsame. l e

My invention. relates `to" certain new and f useful` improvements in furnaces for steaml boilers, but especially for `boilers of the wat ter-tube type and to furnaceswhich use bituminous coal,` lignite, peat`,wood,ytanbark, or y other fuel which `contains large quantities of `"tarry and gaseous `1natter"andWhich'in burn-` ing distils alarge, amount ofcombustible gases."

structand arrange the furnace" that allof in the generation of steam; and with thisend of ,construction and combination of elements hereinafter fully and in detail explained and then `'speciflcally designated by the claims.`

`Inorderthat those skilled in: the art to which my invention appertainsnmay more fullyunderstand its construction and adapll tation, I willprooeedto describe the same in "detail, referring byletter to the accompany- `ing drawings, forming 3part`of this specification, inwhichasapplied toan ordinary horizontal return tubular boiler. Fig. 2 is a vertical cross-section through the boiler Vand the combustionchamber in the rear of the bridge-wall. Fig. 1 3 is a horizontal `cross-section of the furnace, taken over the bridge-wall at the line a, b in l Fig. l.

C is the nre-chamber above the D is the bridge-wall.

E is a combustion-chamber behind the bridge-wall. l e

F is a fire-brick arch or roof covering the 5o greater portion of the combustion-chamber. G G are two wing walls or bale walls grate-bars.

l t l `The objectofthis invention istoso con-` y said gases will be consumed andthe heat gen- Y eratedtherebyrutilizedto the best advantage `other side of the grate. yin `viewiny invention consists in `the details `Figure lisa vertical sectionof my furnace partly closing the passage through the combustion-chamber.

H I-I are several piers of fire-brick built in the rear of the bridge-wall.

I I represent a wall built above the arch F to prevent the passage of the gases above the arch.

In the operation of this furnace with ordinary grates and with bituminous coal or other gaseous fuel the alternate method of feeding highly-heated air; but in this furnace such i air is supplied through the bed of partiallyburned and very hot coal and coke on the one of `cool smoky gas arising from the fresh coal on one side of the grate and the other of clear and very hot gas containing alarge excess of air, pass together over the bridgewall D. Thence the two currents of gas pass The two currents,

under the fire-brick arch F and as they partly v mingle greatly increase in temperature by reason of the combustion of a portion of the gases. When they reach the tall but narrow `vertical opening between the wing `WallsGr G,

passages through the two triangular-shaped spaces between the arch and the boiler,com polling the gases to pass beneath the arch. A small opening or openings may be left in loo ' pass between the arch and-the boiler.

piers H H behind the bridge-wall act as regenerators-that is, they absorb heat from the burned gasses at such times as they' are most intensely heated and `radiate or give up@ heat at such times as the gases are not so hot, as during the first minute afterfeeding;K fresh coal, when there isl a ygreat excess ofy freshly-distilled 'and rather cool gases.

By the meansv above described complete combustion of the Vsmoky gases is secured" when reasonable care is used by theireman, and the resulting thoroughly-burned prod. ucts of combustion are then in the right condition to be allowed to pass into thetubesand give up their heat'to the wafer in the boiler.

Sonne ad vantagesoij' the construction shown herein as .compared with furnaces for'hor'i-l Zontal tubular boilers having fire-chambers covered with tire-brick and Wing walls in proximity to the bridge-wall, such .as,are

shown in two former United lStates .Let-i ters Patent granted to ine-viz., No. 320,563, j'

datedJunef23, 1885, and No.v 604;,158, dated` May 17,'1898-,arei First; In new the construction in Which there is no fire-brickroof over the lire-chamberv the latter is kept comgparativelgyT cool, tendingv to prevent the `fusing of the ash into clink'erv and the excessive radiation 'from ,the firedoors, which are `disadvantaggfes common to brick-coveredfLrefchambers. y

Second. The wing wallsbeiuspflaced .at a considerable distance fromthe bridge-wall the currents of -gas change their direction slowly, and therefore the dla'ftfis not checked, asi-"itis'with4 the sudden `change '0f 4direction which takes'fplace when .the wingwallsare, near the bridge-wall, asin the earlier construction. y

` g V` Third. `Thearch over thevcombustionichamber'andthe wing lwalls @may "be constructed within the ordinary's1ett`ing"oi" ra lhorizontal f tubular boiler without raising the boiler or occupying additional ground-space, which was necessary inthe earlier construction.

Havingthusdescnibed my invention,what

I claim as new, and desire to secure by`Let- 1.Afxurnace for a steam-boiler comprising the iire-cha|nber0 and'its bridge-wall D, located un'der the front portion of the boiler, the 'com'fbustion-chamber Elin the rear of the ibliidge-.Walih fthe -roofF over the combustion- "chamber, a `wall l I above the roof, obstructing the .passage `between the roof and the boiler,and the .wing walls G G under the roof, substantially as showny and described.y

2. Afurnace for asteam-boiler.comprising the hre-chamber C and ,its bridge-wall D,1o cated under the; front portion of the'boiler,

the `combus'tion-chanber E *in the 'near of fthe brid'ge-1Wall,gthe root` F Yover the 4.combusti'onchamber, a wall I I above the roof, obstructingl the. Apassage between Ihe roof and fthe boiler, the piers H H loca'tedin thefrear olf` JpWi'tuesses:`

` J.WERNLI, y fG. BELL. 

